SBD Dauntless - Canopy

Can someone please explain how the Gunner/Radioman canopy worked in the SBD?

I'm guessing it was some type of "telescoping" system that allowed the section at the gunner to slide into the center section behind the pilot. But what about the extreme rear section of canopy - the wrap around section...where did that disappear to?

The only thing I can think of is that it pivoted on a hinge that was located on the sliding track, and swung over the gunners head, THEN slid into the center section.

Am I close?

Also, how about the rear machine guns...where were they stored until mounted and made ready for use?

Sorry if these are really "newbie" questions.....unfortunately, that's what I am